<!-- 轮播图 -->
<template>
  <div class="xtx-carousel" @mouseenter="stop" @mouseleave="AutoPlayFn">
    <ul class="carousel-body" style="--nameColor: red">
      <li
        class="carousel-item"
        v-for="(item, index) in sliders"
        :key="item.id"
        :class="{ fade: activeIndex === index }"
      >
        <RouterLink v-if="item.hrefUrl" :to="item.hrefUrl">
          <img :src="item.imgUrl" alt="" />
        </RouterLink>

        <div v-else class="slider">
          <RouterLink
            v-for="goods in item"
            :key="goods.id"
            :to="`/product/${goods.id}`"
          >
            <img :src="goods.picture" alt="" />
            <p class="name ellipsis">{{ goods.name }}</p>
            <p class="price">&yen;{{ goods.price }}</p>
          </RouterLink>
        </div>
      </li>
    </ul>
    <a href="javascript:;" class="carousel-btn prev" @click="toggle(-1)">
      <i class="iconfont icon-angle-left"></i>
    </a>
    <a href="javascript:;" class="carousel-btn next" @click="toggle(1)">
      <i class="iconfont icon-angle-right"></i>
    </a>
    <div class="carousel-indicator">
      <span
        v-for="(item, index) in sliders"
        :key="index"
        :class="{ active: activeIndex === index }"
        @click="activeIndex = index"
      ></span>
    </div>
  </div>
</template>

<script>
import { onMounted, ref, watch } from "vue";
export default {
  name: "XtxCarousel",
  props: {
    sliders: {
      type: Array,
      default: () => []
    },
    autoPlay: {
      type: Boolean,
      default: true
    },
    duration: {
      type: Number,
      default: 3000
    }
  },
  setup(props) {
    const activeIndex = ref(0);

    // 定时器
    let timers = null;
    // 停止播放
    const stop = () => {
      if (timers) clearInterval(timers);
    };
    // 自动播放
    const AutoPlayFn = () => {
      if (!props.autoPlay) return;
      clearInterval(timers);
      timers = setInterval(() => {
        if (activeIndex.value === props.sliders.length - 1) {
          activeIndex.value = 0;
        } else {
          activeIndex.value++;
        }
      }, props.duration);
    };
    // 如果数组列表大于1，自动播放
    watch(
      () => props.sliders,
      (newValue) => {
        if (newValue.length >= 2) AutoPlayFn();
      }
    );
    // 上 / 下 一张切换
    const toggle = (step) => {
      const temp = activeIndex.value + step;
      if (temp < 0) {
        activeIndex.value = props.sliders.length - 1;
      } else if (temp > props.sliders.length - 1) {
        activeIndex.value = 0;
      } else {
        activeIndex.value = temp;
      }
    };

    return {
      activeIndex,
      AutoPlayFn,
      stop,
      toggle
    };
  }
};
</script>

<style scoped lang="less">
.xtx-carousel {
  width: 100%;
  height: 100%;
  min-width: 300px;
  min-height: 150px;
  position: relative;
  .carousel {
    &-body {
      width: 100%;
      height: 100%;

      .slider {
        display: flex;
        justify-content: space-around;
        padding: 0 40px;
        > a {
          width: 240px;
          text-align: center;
          img {
            padding: 20px;
            width: 230px !important;
            height: 230px !important;
          }
          .name {
            font-size: 16px;
            color: var(--nameColor);
            padding: 0 40px;
          }
          .price {
            font-size: 16px;
            color: @priceColor;
            margin-top: 15px;
          }
        }
      }
    }
    &-item {
      width: 100%;
      height: 100%;
      position: absolute;
      left: 0;
      top: 0;
      opacity: 0;
      transition: opacity 0.5s linear;
      &.fade {
        opacity: 1;
        z-index: 1;
      }
      img {
        width: 100%;
        height: 100%;
      }
    }
    &-indicator {
      position: absolute;
      left: 0;
      bottom: 20px;
      z-index: 2;
      width: 100%;
      text-align: center;
      span {
        display: inline-block;
        width: 12px;
        height: 12px;
        background: rgba(0, 0, 0, 0.2);
        border-radius: 50%;
        cursor: pointer;
        ~ span {
          margin-left: 12px;
        }
        &.active {
          background: #fff;
        }
      }
    }
    &-btn {
      width: 44px;
      height: 44px;
      background: rgba(0, 0, 0, 0.2);
      color: #fff;
      border-radius: 50%;
      position: absolute;
      top: 228px;
      z-index: 2;
      text-align: center;
      line-height: 44px;
      opacity: 0;
      transition: all 0.5s;
      &.prev {
        left: 20px;
      }
      &.next {
        right: 20px;
      }
    }
  }
  &:hover {
    .carousel-btn {
      opacity: 1;
    }
  }
}
</style>
